变温度载荷下薄壁结构非线性动态响应分析  

Analysis of Thin-Wall Structure Nonlinear Dynamic Response Under Variable Thermal Load

作　　者：李纪永[1] 李舜酩[1] 马赛[1] 方立成[1] 

机构地区：[1]南京航空航天大学能源与动力工程学院,南京210016

出　　处：《振动．测试与诊断》2013年第6期950-953,1090,共4页Journal of Vibration,Measurement & Diagnosis

基　　金：航空自然科学基金资助项目(2012ZD52054)

摘　　要：为了研究温度对结构动态响应的影响,计算薄壁结构在不同周期交变温度及不同稳态温度下的非线性动态响应。首先,计算结构在不同周期交变温度载荷下的横向位移响应,探讨温度周期对响应的影响;其次,计算相同声压级不同温度下薄壁结构位移响应及其功率谱密度。结果表明:热屈曲后大温度周期下结构动响应周期与温度周期一致,温度急剧变化时,响应亦呈周期变化,但与温度变化周期不一致;热屈曲前后,结构在噪声载荷作用下相轨迹反映结构平衡位置个数,存在两个平衡位置易导致结构跳变响应;随温度升高,结构刚度呈非线性,温度及噪声对结构刚度的贡献大小差异导致不同的非线性动态响应。To investigate temperature effect on structure dynamic response,thin-wall structure nonlinear dynamic response under different periodic and steady-state temperature is calculated.Firstly,the structure transverse displacement under different periodic temperature is calculated,and temperature periodic effect on structure response is discussed.Secondly,the displacement response under the same SPL with different temperature is calculated,its PSD is analyzed.The results show that the large temperature period results in the same period of dynamic response,while rapid temperature variations cause different period displacement response with different value compared with temperature period.Phase trajectory reveals the equilibrium position number previous and beyond thermal-buckling,and structure snap-through response prefers to occur when there are two equilibrium positions.The structure stiffness becomes nonlinear as temperature rises,and the different contributions of temperature and acoustic to structure stiffness result in different structure nonlinear dynamic responses.

关 键 词：薄壁结构 周期温度 热屈曲 非线性动态响应 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]